Local code execution via out-of-bounds read
Published Mar 10, 2026 · Updated Mar 10, 2026
Out-of-bounds read in Microsoft Office Excel allows unauthenticated local users to execute code via unspecified local vectors. Microsoft has not disclosed the Excel component, input structure, or memory operation that triggers the out-of-bounds read. Exploitation requires local access but no privileges or user interaction and can compromise confidentiality, integrity, and availability.
Summary
What happened
Out-of-bounds read in Microsoft Office Excel allows unauthenticated local users to execute code via unspecified local vectors. Microsoft has not disclosed the Excel component, input structure, or memory operation that triggers the out-of-bounds read. Exploitation requires local access but no privileges or user interaction and can compromise confidentiality, integrity, and availability.
The record
- CVE
- CVE-2026-26109
- Published
- Mar 10, 2026
- Updated
- Mar 10, 2026
- Vendor
- Microsoft
- Product
- Microsoft Office LTSC for Mac 2024
- Classifications
- CWE-125, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 10, 2026CVE publishedPublication date reported by the CVE source.
- Mar 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.107.26030819
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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